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Other long-term liabilities - Schedule of Long-Term Liabilities and Deferred Credits (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2021 $ / shares | Dec. 31, 2019 USD ($)
Other Long-term Liabilities |  |  |  |  |
Contract adjustment payments on Green Equity Units |  | $ 187,580 | $ 0 |  |
Asset retirement obligations |  | 142,147 | 79,968 |  | $ 53,879
Advances in aid of construction |  | 82,580 | 79,864 |  |
Environmental remediation obligation |  | 55,224 | 69,383 |  | $ 58,061
Customer deposits |  | 32,633 | 31,939 |  |
Unamortized investment tax credits |  | 17,439 | 17,893 |  |
Deferred credits and contingent consideration |  | 35,982 | 21,399 |  |
Preferred shares, Series C |  | 13,348 | 13,698 |  |
Hook-up fees |  | 21,904 | 17,704 |  |
Lease liabilities (note 1(q)) |  | 22,512 | 14,288 |  |
Contingent development support obligations |  | 4,612 | 12,273 |  |
Notes payable to related party |  | 25,808 | 30,493 |  |
Other |  | 42,050 | 23,027 |  |
Other long-term liabilities |  | 683,819 | 411,929 |  |
Less: current portion |  | (167,908) | (72,748) |  |
Other long-term liabilities, excluding current |  | 515,911 | 339,181 |  |
Green Equity Units issued (in shares) | shares | 23,000,000 |  |  |  |
Green Equity Units, annual distributions (percent) | 7.75% |  |  |  |
Green Equity Units, share purchase contract, interest rate (percent) | 6.57% |  |  |  |
Contract adjustment payments, accretion period | 3 years |  |  |  |
Transfers from advances in aid of construction to contributions in aid of construction |  | 6,376 | 1,994 |  |
Undiscounted, unescalated cost of environmental cleanup activities |  | 57,167 | 64,766 |  |
Accrual for environmental loss contingencies to be incurred over next four years |  | 36,627 |  |  |
Regulatory assets |  | $ 1,167,625 | 846,519 |  |
U.S. Dollar Senior Unsecured Notes (Green Equity Units) | Senior Unsecured Notes |  |  |  |  |
Other Long-term Liabilities |  |  |  |  |
Proceeds from Green Equity Units | $ 1,150,000 |  |  |  |
Weighted average coupon | 1.18% | 1.18% |  |  |
Equity Method Investee |  |  |  |  |
Other Long-term Liabilities |  |  |  |  |
Notes payable to related party |  | $ 25,808 | $ 30,493 |  |
Series C Preferred Stock |  |  |  |  |
Other Long-term Liabilities |  |  |  |  |
Redeemable preferred stock issued (in shares) | shares |  | 100 |  |  |
Preferred stock redemption price per share (in CAD per share) | $ / shares |  |  |  | $ 53,400,000 |
Note payable to related party |  |  |  |  |
Other Long-term Liabilities |  |  |  |  |
Interest rate (percent) |  | 4.00% | 0.675% |  |
Other |  |  |  |  |
Other Long-term Liabilities |  |  |  |  |
Contingent consideration related to prior acquisition |  | $ 5,000 |  |  |
Environmental costs |  |  |  |  |
Other Long-term Liabilities |  |  |  |  |
Environmental remediation, rate recovery period |  | 7 years |  |  |
Regulatory assets |  | $ 81,802 | $ 87,308 |  |
Minimum |  |  |  |  |
Other Long-term Liabilities |  |  |  |  |
Other liability repayment period |  | 5 years |  |  |
Accrual for environmental cleanup, discount rate (percent) |  | 1.00% |  |  |
Maximum |  |  |  |  |
Other Long-term Liabilities |  |  |  |  |
Other liability repayment period |  | 40 years |  |  |
Accrual for environmental cleanup, discount rate (percent) |  | 3.40% |  |  |

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